Vertical water-tube boiler.



G. T. LADD.

VERTICAL WATER TUBE BOILER.

APPLICATION FILED JAN- 2!. 1915- 1,23,53U Patented Aug. 28, 1917.

3 SHEETS-SHEET 1.

INVENTOR I w w W 4*? v 4% f g m LKKOJMXLLM WITNESSES g u G. T. LADD.

VERTICAL WATER TUBE BOILER.

APPLICATION FILED JAN. 21. I915.

Patented Aug. 28; 1917.

3 SHEETS-SHEET 2.

INVENTOR WITNESSES G. T. LADD.

VERTICAL WATER TUBE BOILER.

APPLICATION FILED JAN. 21. 1915.

3 SHEETS-SHEET 3.

WITNESSES INVENTOR Patented Aug. 28, 1917.

GEORGE 1?. LADD, 0F PTTTSBURG-H, PENNSYLVANIA.

VERTICAL WATER-TUBE BOILER.

Specification of Letters Patent.

Patented Aug. 2?), 319152.

Application filed January 521, 1915. Serial Ito. 3,531

To all whom it may concern:

Be it lmown that l, Gnome T. Lam), residing at Pittsburgh, in the countyof Alla gheny and State of Pennsylvania, a citizen of the United States,have invented or discovered certain new and useful Improvements inVertical Water-Tube Boilers, of which improvements the following is aspecification.

In the accompanying drawings iorminga part of this specification, Figure1 is a side elevation of an upper drum of a vertical water tube boilerhaving my improved supporting means applied thereto; Fig. 2 is an endelevation of the construction shown in Fig. 1; Figs. 3 and 4 are end andside views respectively illustrating a modification in the form ofsupport; Figs. 5, 6 and 7, 8 are views similar respectively to Figs. 3and 4, illustrating further modifications of the supporting means; Fig.9 is an end elevation of a drum supported by a strap extendingunderneath the drum; Figs. 10'and 11 are views similar to Fig. 3,illustrating certain modifications and Fig. 12 is a sectional elevationof a complete boiler arranged in its setting and showing my improvedmanner of suspension.

The invention described herein relates to that type of boiler consistingof upper and lower drums and tubes more or less vertical, connectingsaid drums. It is desirable and is generally the practice to support theupper drum by which the'lower drum is supported through the medium ofthe tubes, thus allowing the tubes. and lower drum to move freely. Ithas been the practice to support the upper drum by means of saddlesforming portions of the end walls of the boiler setting, the shell ofthe boiler resting in said saddles at points closely adjacent to itsends. In such an arrangement the ends of the upper drum are outside ofthe setting, an arrangement at times very undesirable. When it isrequired that the upper druin should be wholly within the setting, twoformsof sup ort have been employed. In one case brac ets are riveted tothe heads of the upper drum and rest on the end walls of the setting, sothat these heads are subjected not only to the pressure of the steam inthe drum but to strains incident to carrying the entire weight of theboiler and the water. In the other form of support, channel bars orT-beams are arranged above and at right angles to the drum and rest onthe side walls of the setting and to these bars or beams are securedstraps riveted to the sides of the upper drum. While this latterarrangement will relieve the heads of the drum from the double strainsabove mentioned, it is objectionable as necessitating a greater heightof boiler room to afl'ord the necessary head room for the boiler.

The invention described has for its object a construction in which theboiler supports are arranged below the highest part of the upper drumand are attached to the sides of the latter.

In the practice of my invention the supporting beams 2 which may beeither two channel sections as shown in Figs. 1 to 9, inclusive, or asingle channel section as shown in Fig. 10 or an l-section as shown inFig. 11 are arranged parallel with the axis of the upper drum 3 of theboiler and have their ends supported by theend walls of the boilersetting. It is preferred that the ends of the beams should be directlysupported by a girder 4: forming portions of the end walls of thesetting. The end walls of the setting are made of such a height and thebeams 52 of such a depth that when the boiler is in position the upperedges of the beams will not be above the highest part of the boiler asforexample the steam-nozzle 5. It is preferred that the edges should besubstantially below the highest portion of the upper drum.

The invention as expressed in the broader claims is not limited to anyspecific construction of the connections between the drum and thesupporting beams, as many forms of such connection in addition to thoseshown herein will readily suggest themselves to one skilled in the art.

In the construction shown in Figs. 1 to 4:, pieces of metal are soslotted, bent and riveted to the shell of the drum as to form loops 6for the reception of pins 7, which are also passed through eyes 8 forthe strap 9. In the construction shown in Figs. 1 and 2 the strapconsists of strips of metal suitably bent and having their upper endssecured between the channel sections forming the support beams by pinspassing through straps and beams 2.

In the form shown in Figs. 3 and 4 the straps 9 have the eyes for thereception of the pins 7 forged on one end and the oppo-v site endsthreaded. for the reception of nuts 10 bearing on cross pieces restingon the upper edges of the beams.

In the construction shown in Fi s. 5 and 6, a U-shaped strap 9 isemployed, t e closed end of thestrap being arranged in loops 6 formed bysuitably bending and riveting pieces of metal to the shell of the drum.The legs of the U-shape pass up between the channel sections forming thebeams and have their ends threaded for the reception of nuts 10, whichas in the construction shown in Figs. 3 and 4 bear on cross-piecesresting on the upper edges of the beams.

In the construction shown in Figs. 7 and 8, the straps 9 connecting thedrum to the beams consist of strips of metal having one end riveted tothe boiler while the opposite ends extend up between the members of thebeams and are bolted thereto.

In lieu of connecting the drums to the V supporting beams by means ofstraps attached to the shell by means of rivets, the drum may rest inthe loop of U-shaped bars 11, the legs of which extend up along oppositesides of the drums and between the channel sections of the beams asshown in Fig. 9. The protruding ends of the legs are threaded for thereception of nuts 10, which as in the forms shown in Figs. 3 and 5 bearon plates laid .across the upper edges of the beams.

If the boiler is small, and therefore the load to be carried by thebeams comparatively light, the beams may be formed of single channelbars 2 as shown in Fig. 10, in which the straps connecting the drum andbeams, will by preference be riveted to the beams. And further the beams2* may be formed I-shape as shown in Fig. 10, in which case, the innerlower flanges of the shape will be notched to fit around the connectionof the straps to the drum.

The number of connections between the drum and beams may be more thantwo on a side, and will generally be dependent on the length of the drumand the weight of the load carried by the upper drum. It will beobserved that in all the forms shown, except that illustrated in Fig. 9,the straps are connected to the drum above the longitudinal seams, aconstruction generally preferable, as seams and supporting parts are notsubjected to flame and hot gases.

In order to protect the connections of the straps with the beams or drumfrom shearing strains as the boiler expands and contracts, the eyeportions of the straps are made sufiiciently narrower than the distancebetween the loops 6 on the drum thereby pet mitting of the independentlongitudinal movement of the drama, as shown in Figs. 1 and 4. In theconstruction shown in Figs. 5 and 6 the portion ofthe U-shaped strapengaging the loop on the drum is made sufficiently longer than the loopto permit the necessary expansion of the drum. In the construction shownin Figs. 7 and 8 where the straps are riveted to the drum the bolt holesin the supporting beams or the straps or both are elongated so that thestraps will slide along the beams as the length of the drum varies.

I claim herein as my invention:

1. In a boiler, the combination of an upper drum, tubes extendingdownwardly from the upper drum, a lower drum connected to and supportedby said tubes, beams arranged substantially parallel with the axes ofsaid drums, and on opposite sides of the upper drum and adapted torestat their ends on the boiler setting, and means for connecting theupper drum to-said beams which form the sole support of the boilerwhereby the boiler is free to move in its setting.

2. A boiler consisting of upper and lower drums and tubes connectingsaid drums in combination with beams arranged on opposite sides of theupper drum and in substantial parallelism with the axis thereof andresting at their ends on the boiler setting, and means for so connectingthe upper drum to the beams that the beams forming the sole support ofthe boiler will be below a horizontal plane passing through the highestportion of the drum.

3. A boiler consisting of upper and lower drums and tubes connectingsaid drums, in combination with beamsarranged on opposite sides of thedrum and in substantial parallelism to the axis thereof and resting attheir ends on the boiler setting, and straps attached to the beams andto the upper drum at points above a horizontal plane coincident with theaxis of the drum and adapted to so support the drum that the supportingbeams will be intermediate the points of attachment of the straps andthe highest portion of the drum.

4. A boiler consisting of upper and lower drums and connecting tubes incombination with beams arranged substantially parallel with the axes ofthe upper drum and on opposite sides thereof and adapted to rest attheir ends on the boiler setting, and means for suspending the upperdrum between the beams forming the support for the boiler, thesuspending) means interposed between the drum and earns being adapted topermit of the movement of the boiler independent of the supportingbeams.

5. In a boiler, the combination of an upper drum, beams arrangedsubstantially parallel with the axis of said drum and on opposite sidesthereof ami adapted. to rest at their In testimony whereof, I havehereunto sei; ends on the boiler setting, means for susmy hand. pendingthe upper drum from said beams, a

GEORGE T. LADD. lower drum, and tubes connecting the upper Witnesses:

v 5 and lower drums and forming the sole sup- THOS. B. JOYCE,

port for the latter. Gr. Gr. TRILL.

